Is CsWinRT compatible with .NET 8 AOT?

[Simon Mourier (smourier)]

Hi,

I have this project:

<Project Sdk="Microsoft.NET.Sdk">
	<PropertyGroup>
		<OutputType>Exe</OutputType>
		<TargetFramework>net8.0-windows10.0.19041.0</TargetFramework>
		<ImplicitUsings>enable</ImplicitUsings>
		<Nullable>enable</Nullable>
		<PublishAot>true</PublishAot>
		<EnableAotAnalyzer>true</EnableAotAnalyzer>
	</PropertyGroup>
</Project>

And this C# code:

using Windows.Devices.Enumeration;

namespace ConsoleAppAot
{
    internal class Program
    {
        static void Main(string[] args)
        {
            var res = DeviceInformation.FindAllAsync().GetResults();
        }
    }
}

Builds fine but when I run, I get a PlatformNotSupportedException error from WinRT's GuidGenerator:

Unhandled exception. System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
 ---> System.TypeInitializationException: The type initializer for 'ABI.Windows.Foundation.IAsyncOperation`1' threw an exception.
 ---> System.TypeInitializationException: The type initializer for 'Vftbl' threw an exception.
 ---> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
 ---> System.TypeInitializationException: The type initializer for 'ABI.System.Collections.Generic.IReadOnlyList`1' threw an exception.
 ---> System.TypeInitializationException: The type initializer for 'Vftbl' threw an exception.
 ---> System.PlatformNotSupportedException: Operation is not supported on this platform.
   at System.Linq.Expressions.Compiler.DelegateHelpers.MakeNewCustomDelegate(Type[] types)
   at System.Linq.Expressions.Compiler.DelegateHelpers.MakeDelegateType(Type[] types)
   at ABI.System.Collections.Generic.IReadOnlyList`1.Vftbl..cctor()
   --- End of inner exception stack trace ---
   at ABI.System.Collections.Generic.IReadOnlyList`1..cctor()
   --- End of inner exception stack trace ---
   at ABI.System.Collections.Generic.IReadOnlyList`1.GetGuidSignature()
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Void** arguments, Signature sig, Boolean isConstructor)
   at System.Reflection.MethodBaseInvoker.InvokeWithNoArgs(Object obj, BindingFlags invokeAttr)
   --- End of inner exception stack trace ---
   at System.Reflection.MethodBaseInvoker.InvokeWithNoArgs(Object obj, BindingFlags invokeAttr)
   at System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters)
   at WinRT.GuidGenerator.GetSignature(Type type)
   at WinRT.GuidGenerator.GetSignature(Type type)
   at WinRT.GuidGenerator.<>c.<GetSignature>b__2_1(Type t)
   at System.Linq.Enumerable.SelectArrayIterator`2.MoveNext()
   at System.String.Join(String separator, IEnumerable`1 values)
   at WinRT.GuidGenerator.GetSignature(Type type)
   at WinRT.GuidGenerator.CreateIID(Type type)
   at ABI.Windows.Foundation.IAsyncOperation`1.Vftbl..cctor()
   --- End of inner exception stack trace ---
   at ABI.Windows.Foundation.IAsyncOperation`1..cctor()
   --- End of inner exception stack trace ---
   --- End of inner exception stack trace ---
   at System.RuntimeFieldHandle.GetValue(RtFieldInfo field, Object instance, RuntimeType fieldType, RuntimeType declaringType, Boolean& domainInitialized)
   at System.Reflection.RtFieldInfo.GetValue(Object obj)
   at WinRT.GuidGenerator.GetIID(Type type)
   at WinRT.IWinRTObject.IsInterfaceImplementedFallback(RuntimeTypeHandle interfaceType, Boolean throwIfNotImplemented)
   at WinRT.IWinRTObject.System.Runtime.InteropServices.IDynamicInterfaceCastable.IsInterfaceImplemented(RuntimeTypeHandle interfaceType, Boolean throwIfNotImplemented)
   at WinRT.ComWrappersSupport.CreateRcwForComObject[T](IntPtr ptr, Boolean tryUseCache)
   at WinRT.ComWrappersSupport.CreateRcwForComObject[T](IntPtr ptr)
   at WinRT.MarshalInspectable`1.FromAbi(IntPtr ptr)
   at WinRT.MarshalInterface`1.FromAbi(IntPtr ptr)
   at ABI.Windows.Devices.Enumeration.IDeviceInformationStaticsMethods.FindAllAsync(IObjectReference _obj)
   at Windows.Devices.Enumeration.DeviceInformation.FindAllAsync()
   at ConsoleAppAot.Program.Main(String[] args) in E:\smo\work\ConsoleApp33\ConsoleAppAot\Program.cs:line 9

Is this supposed to work? Am I missing some configuration?

[Manodasan Wignarajah (manodasanW)]

Our public NuGet packages don't support AOT yet, but it is coming soon. Right now, all changes related to our AOT support are in our staging branch (staging/AOT).